28728842 has 8 divisors (see below), whose sum is σ = 43120836. Its totient is φ = 14355232.

The previous prime is 28728787. The next prime is 28728851. The reversal of 28728842 is 24882782.

It can be written as a sum of positive squares in 2 ways, for example, as 20079361 + 8649481 = 4481^2 + 2941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28728842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398 + ... + 7590.

Almost surely, 2^28728842 is an apocalyptic number.

28728842 is a deficient number, since it is larger than the sum of its proper divisors (14391994).

28728842 is a wasteful number, since it uses less digits than its factorization.

28728842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9192.

The product of its digits is 114688, while the sum is 41.

The square root of 28728842 is about 5359.9292905784. The cubic root of 28728842 is about 306.2711154676.

The spelling of 28728842 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred forty-two".